Wonderfest: Pleasure vs. Happiness - Hacking the American Mind

The Declaration of Independence proclaims our right to "life, liberty, and the pursuit of happiness," but not to the pursuit of pleasure. What is the neurological difference between these two positive emotions of happiness and pleasure? Has society's exploitation of pleasure systematically weakened our grasp on happiness? What has caused the twin epidemics of these emotions' negative extremes: addiction (from too much pleasure) and depression (from too little happiness)?